Every new IP published by Nintendo last generation:
Pikmin
Battalion Wars
Chibi-Robo
Custom Robo
Eternal Darkness
Odama
Advance Wars (first outside Japan)
Fire Emblem (first outside Japan)
Animal Crossing (first outside Japan)
Golden Sun
Final Fantasy Crystal Chronicles (They own 2nd party rights)
This generation to date:
ASH: Archaic Sealed Heat
Big Brain Academy
Brain Age
Clubhouse Games
Jump Stars (Japan only, but great import)
Electroplankton
Elite Beat Agents
Hotel Dusk
Inazuma Eleven
Jet Impulse
Magical Starsign
Magnetica
Meteos
Nintendogs
Planet Puzzle League
Polarium
Project Hacker
Trace Memory
Time Hollow
Touch Golf
Wander Donkey (Don't ask)
Wii series (Sports, Fit, Play, Chess, Music, Motorsports)
Disaster: Day of Crisis
Endless Ocean
Excite Truck
Most of those are on the DS (all of them except the last 4), but you should have no concern at all about new IPs on the Wii. I seriously doubt any company has published as many new IPs as Nintendo in the last 3 years.
